CVE-2026-13321

{
  "id": "CVE-2026-13321",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-22T15:16:52.200",
  "lastModified": "2026-10-24T18:10:00.163",
  "vulnStatus": "Undergoing Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The BIND resolver accepts validly-signed NSEC records where the \"Next Domain Name\" field points outside the signer's zone.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1."
    },
    {
      "lang": "es",
      "value": "El resolvedor BIND acepta registros NSEC válidamente firmados donde el campo ’Next Domain Name’ apunta fuera de la zona del firmante.\nEste problema afecta a las versiones de BIND 9 9.11.0 hasta 9.18.50, 9.20.0 hasta 9.20.24, 9.21.0 hasta 9.21.23, 9.11.3-S1 hasta 9.18.50-S1, y 9.20.9-S1 hasta 9.20.24-S1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "ISC",
          "product": "BIND 9",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "9.11.0",
              "lessThanOrEqual": "9.18.50",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "9.20.0",
              "lessThanOrEqual": "9.20.24",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "9.21.0",
              "lessThanOrEqual": "9.21.23",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "9.11.3-S1",
              "lessThanOrEqual": "9.18.50-S1",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "9.20.9-S1",
              "lessThanOrEqual": "9.20.24-S1",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-22T18:51:32.344539Z",
          "id": "CVE-2026-13321",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-346"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://downloads.isc.org/isc/bind9/9.20.26",
      "source": "[email protected]"
    },
    {
      "url": "https://downloads.isc.org/isc/bind9/9.21.24",
      "source": "[email protected]"
    },
    {
      "url": "https://kb.isc.org/docs/cve-2026-13321",
      "source": "[email protected]"
    }
  ]
}